<template>
    <transition name="slide">
        <div class="user-center">
            <div class="back" @click="back">
                <i class="icon-back"></i>
            </div>
            <div class="switches-wrapper">
                <Switches @switch="switchItem"
                          :switches="switches"
                          :currentIndex="currentIndex"
                >
                </Switches>
            </div>
            <div class="play-btn" ref="playBtn" @click="random">
                <i class="icon-play"></i>
                <span class="text">随机播放全部</span>
            </div>
            <div class="list-wrapper" ref="listWrapper">
                <Scroll ref="favoriteList" class="list-scroll" v-if="currentIndex === 0" :data="favoriteList">
                    <div class="list-inner">
                        <SongList :songs="favoriteList" @select="selectSong"></SongList>
                    </div>
                </Scroll>
                <Scroll ref="playList" class="list-scroll" v-if="currentIndex === 1" :data="playHistory">
                    <div class="list-inner">
                        <SongList :songs="playHistory" @select="selectSong"></SongList>
                    </div>
                </Scroll>
            </div>
            <div class="no-result-wrapper" v-show="noResult">
                <NoResult :title="noResultDesc"></NoResult>
            </div>
        </div>
    </transition>
</template>

<script>
import Switches from '../../base/Switches/Switches'
import Scroll from '../../base/Scroll/Scroll'
import SongList from '../../base/SongList/SongList'
import NoResult from '../../base/NoResult/NoResult'
import Song from '../../common/js/song'
import { mapGetters, mapActions } from 'vuex'
import { playListMixin } from '../../common/js/mixin'

export default {
    mixins : [playListMixin],
    data () {
        return {
            currentIndex : 0,
            switches : [
                {
                    name : '我喜欢的'
                },
                {
                    name : '最近听的'
                }
            ]
        }
    },
    computed : {
        noResult () {
            if (this.currentIndex === 0) {
                return !this.favoriteList.length
            } else {
                return !this.playHistory.length
            }
        },
        noResultDesc () {
            if (this.currentIndex === 0) {
                return '暂无收藏歌曲'
            } else {
                return '你还没有听过歌曲'
            }
        },
        ...mapGetters([
            'favoriteList',
            'playHistory'
        ])
    },
    methods : {
        handlePlayList (playlist) {
            const bottom = playlist.length > 0 ? '60px' : ''
            this.$refs.listWrapper.style.bottom = bottom
            this.$refs.favoriteList && this.$refs.favoriteList.refresh()
            this.$refs.playList && this.$refs.playList.refresh()
        },
        switchItem (index) {
            this.currentIndex = index
        },
        selectSong (song) {
            this.insertSong(new Song(song))
        },
        back () {
            this.$router.back()
        },
        random () {
            let list = this.currentIndex === 0 ? this.favoriteList : this.playHistory
            if (list.length === 0) {
                return
            }
            list = list.map((song) => {
                return new Song(song)
            })
            this.randomPlay({
                list
            })
        },
        ...mapActions([
            'insertSong',
            'randomPlay'
        ])
    },
    components : {
        Switches,
        Scroll,
        SongList,
        NoResult
    }
}
</script>

<style scoped lang="stylus">
@import "~common/stylus/variable"

.user-center
  position: fixed
  top: 0
  bottom: 0
  z-index: 100
  width: 100%
  background: $color-background
  &.slide-enter-active, &.slide-leave-active
    transition: all 0.3s
  &.slide-enter, &.slide-leave-to
    transform: translate3d(100%, 0, 0)
  .back
    position absolute
    top: 0
    left: 6px
    z-index: 50
    .icon-back
      display: block
      padding: 10px
      font-size: $font-size-large-x
      color: $color-theme
  .switches-wrapper
    margin: 10px 0 30px 0
  .play-btn
    box-sizing: border-box
    width: 135px
    padding: 7px 0
    margin: 0 auto
    text-align: center
    border: 1px solid  $color-text-l
    color: $color-text-l
    border-radius: 100px
    font-size: 0
    .icon-play
      display: inline-block
      vertical-align: middle
      margin-right: 6px
      font-size: $font-size-medium-x
    .text
      display: inline-block
      vertical-align: middle
      font-size: $font-size-small
  .list-wrapper
    position: absolute
    top: 110px
    bottom: 0
    width: 100%
    .list-scroll
      height: 100%
      overflow: hidden
      .list-inner
        padding: 20px 30px
  .no-result-wrapper
    position: absolute
    width: 100%
    top: 50%
    transform: translateY(-50%)
</style>
